Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d553f61e392b3e…

MALICIOUS

PDF

96.3 KB Created: 2021-09-02 20:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cfa5f1c071789521dcfa11f2b7f2a9b SHA-1: 0dea99c21aede35ec8f17b235790004bec775e71 SHA-256: 37d553f61e392b3efbc0663cd1912d03e0ba8a1b1be2c5206f22846da1834b56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=thematic+relations+pdf PDF link annotation
    • https://stabiactiv.com/userfiles/file/jefipakugusix.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/peresabuzori.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b15786c200---97096470344.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114245cdafd3---nituvi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca68877f0---nepujuxiwitij.pdfIn PDF document text
    • http://davcpundri.com/css/file/zodagorexedusuvawixemof.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/52863013211.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/lufufu.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/96894933498.pdfIn PDF document text
    • https://kultmotor.hu/images/files/zusobukuji.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076a964382e2---repizewadixikarumujusi.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/rekefofofedinudawamogov.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/neviwomiba.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ce4a144ee06e2d03692246831e68194f/mejinuta.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/legodimi.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/majefabefopuzolim.pdfIn PDF document text
    • http://kodemari.info/data/files/puvadisepigitobo.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31743b206---72681626288.pdfIn PDF document text
    • http://yoron.net/up/files/88907939568.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sobixites.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a904b9cc---xujejanozawatemewek.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/wobegitenupinijozafet.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85d706ee6---wifabuwisip.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/95706861729.pdfIn PDF document text
    • https://kuepancong.com/contents//files/rifumo.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/35036888850.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 18440 bytes
SHA-256: 79f026d22556650cf264e4653d22acaa412cd1b6f65b9f46661a75e7483731c9
font_01_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC9 10848 bytes
SHA-256: 380bc13dc7edb7e1bbfe9c2981e052f693e2cef9fdc284c67c119789307b9edd

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